FINMA announced on Friday that it was looking into a number of ICOs for breaching "provisions on combating money laundering and terrorist financing" and other regulations.

ICOs allow startups to issue their own digital token to raise, in some cases, millions of dollars in a matter of seconds. They've come under scrutiny by regulators because companies are often able to raise money through an ICO without disclosing substantive information to investors.

FINMA said in a statement certain ICOs may be subject to existing financial regulations.

"Given the close resemblance, in some respects, between ICOs/token-generating events and conventional financial-market transactions, one or more aspects of financial market law may already cover ICO campaigns according to their various models," the agency wrote.

Switzerland has been relatively open to cryptocurrencies, with one town in the country allowing residents to pay their taxes in bitcoin, the largest digital coin, according to CoinDesk. In July, FINMA gave clearance for Falcon Private Bank to offer bitcoin-linked products to its clients.

Still, the massive growth of the ICO market, which has ballooned to more than $2 billion this year, according to data from fintech analytics firm Autonomous NEXT, has forced the agency to crack down.

On the whole, the guidance has been viewed positively by folks in the cryptocurrency community.

Oliver Bussmann, president of the Crypto Valley Association, a Swiss organization, said in a statement emailed to Business Insider that the announcement comes as no surprise.

"FINMA clearly states in its guidance that it supports the innovative potential of blockchain technology, but also that, depending on the structure, regulation can and should apply," Bussmann said. "We think this is another sign of the Swiss regulator's clear and balanced approach to blockchain and Fintech."

Serafin Lion Engel, a blockchain expert and CEO of DataWallet, said the statements by FINMA "set exactly the right tone."

"The agency appreciates the innovative potential of ICOs and is cognizant of the groundbreaking implications of the technology ICOs are driving," he said.